Urban art

I spotted this in a small park I’ve walked past many times. I’m not sure if I’ve blipped it before.
Some study, a good lesson with my young friend and a nice walk after. I don’t think you’re listening he said. I apologised and said I was thinking. He couldn’t believe I was a student because I’m old. I like his perspective on life. Then home to teach my late class. An early finish as we were doing tests.